- - gonadal d. defective gonadal development, varying types and degrees of which have been identified, including gonadal aplasia or agenesis, rudimentary gonads, congenitally defective gonads, and true hermaphroditism; the character of the external genitalia, genital ducts, and secondary sexual development are only sometimes uniquely related to a given type of gonadal d. XO gonadal d. consists of monosomy X with a gonadal streak rather than a true ovary, notably seen in Turner syndrome; XX gonadal d. is an autosomal recessive disorder with a female karyotype, streaked gonads, and primary amenorrhea, but with no body features of Turner syndrome; XY gonadal d. is an X-linked disorder associated with a male karyotype and a female habitus, streaked gonads, and absence of secondary sexual characteristics.- iridocorneal mesenchymal d. d. of cornea and iris, producing pupillary anomalies, posterior embryotoxon, and secondary glaucoma, resulting in part from anomalous development of the ocular mesenchyme.- seminiferous tubule d. rarely used term for a disorder in which the seminiferous tubules exhibit an abnormal cytoarchitecture and extensive hyalinization; the testes are small, and few spermatozoa are formed; the body habitus may be eunuchoid, and gynecomastia may be present; urinary gonadotropin output is usually high, and the incidence of mental deficiency and illness increased; sex chromatin may be male or female, and androgen secretion ranges from subnormal to normal. It is a constant feature of (and the term may be used synonymously with) Klinefelter syndrome. SYN: germinal aplasia.- testicular d. [MIM*305700] a congenital derangement of seminiferous tubular structure and function, resulting in male infertility; the defect in spermatogenesis may be incomplete, as in maturational arrest or premature sloughing, or spermatogenesis may be completely absent, as in the Sertoli-cell-only syndrome.
* * *dys·gen·e·sis (')dis-'jen-ə-səs n, pl -e·ses -.sēz defective development esp. of the gonads (as in Klinefelter's syndrome or Turner's syndrome)
* * *n.faulty development. Gonadal dysgenesis is failure of the ovaries or testes to develop (see Turner's syndrome).
* * *dys·gen·e·sis (dis-jenґə-sis) defective development; see also dysplasia and dyspoiesis.
Medical dictionary. 2011.
Look at other dictionaries:
Dysgenesis — can be used for:*As a synonym for agenesis referring to the failure of an organ to develop during embryonic growth and development.*To refer to a population undergoing artificial selection, where selection is producing a population considered… … Wikipedia
Dysgenesis — Dys*gen e*sis, n. [Pref. dys + genesis.] (Biol.) A condition of not generating or breeding freely; infertility; a form of homogenesis in which the hybrids are sterile among themselves, but are fertile with members of either parent race. [1913… … The Collaborative International Dictionary of English
dysgenesis — n. faulty development. Gonadal dysgenesis is failure of the ovaries or testes to develop (see Turner s syndrome) … The new mediacal dictionary
Dysgenesis — ydingoji raida statusas T sritis gyvūnų raida, augimas, ontogenezė, embriologija atitikmenys: lot. Dysgenesis ryšiai: platesnis terminas – nenormalumas sinonimas – disgenezė … Veterinarinės anatomijos, histologijos ir embriologijos terminai
Dysgenesis — ydingoji raida statusas T sritis embriologija atitikmenys: lot. Dysgenesis ryšiai: platesnis terminas – nenormalumas … Medicininės histologijos ir embriologijos vardynas
dysgenesis — noun Etymology: New Latin Date: 1962 defective development especially of the gonads (as in Klinefelter s syndrome) … New Collegiate Dictionary
dysgenesis — /dis jen euh sis/, n. Pathol. defective development of an organ, as of the gonads in Klinefelter s syndrome. [1880 85; DYS + GENESIS] * * * … Universalium
dysgenesis — noun Defective development … Wiktionary
dysgenesis — sterility in hybrid creatures Causation and Formation … Phrontistery dictionary
dysgenesis — n. abnormal development of an organ … English contemporary dictionary